CN103778459A - Radio frequency identification card based on envelope detection - Google Patents
Radio frequency identification card based on envelope detection Download PDFInfo
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- CN103778459A CN103778459A CN201210405962.6A CN201210405962A CN103778459A CN 103778459 A CN103778459 A CN 103778459A CN 201210405962 A CN201210405962 A CN 201210405962A CN 103778459 A CN103778459 A CN 103778459A
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- envelope detection
- diplexer
- output
- card based
- identification card
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Abstract
The invention discloses a radio frequency identification card based on envelope detection. The radio frequency identification card based on envelope detection comprises a diplexer in two-way communication with an identification-end system; the diplexer transmits received signals to an envelope detector and the signals are then inputted to an MCU unit through an amplifier and a comparator; the card also comprises a local oscillator; output of the local oscillator is connected with a carrier generator; output of the carrier generator is connected with a frequency mixer; the frequency mixer receives baseband signals from the MCU unit; and the output of the frequency mixer is connected with the diplexer through a filter. According to the radio frequency identification card based on envelope detection, a hardware unit for signal demodulation in the envelope detection method is provided and a hardware unit for meeting demodulation signals is provided, subsequent software carrying is convenient, and an idea is provided for development of the technology in the field.
Description
Technical field
The present invention relates to a kind of radio-frequency identification card based on envelope detection.
Background technology
Radio-frequency (RF) identification is RFID(Radio Frequency IDentification) technology, claim again electronic tag, radio frequency identification, it is a kind of communication technology, can identify specific objective and read and write related data by radio signals, and without setting up machinery between recognition system and specific objective or optics contacts.The technology such as conventional have low frequency (125k ~ 134.2K), high frequency (13.56Mhz), a ultrahigh frequency, passive.Rfid interrogator also divides portable with fixed, RFID technology application is at present very wide, as library, and gate control system, food security is traced to the source etc.In prior art, radio-frequency card has had various structures form, but the trivial response mode that adopts is carried comparatively difficulty of software more on it.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of radio-frequency identification card based on envelope detection, there is feature easy to use simple in structure.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of radio-frequency identification card based on envelope detection, comprise one with the diplexer of identification end system two-way communication, the signal of reception is transferred to envelope detector by diplexer, after amplifier and comparer, input to again MCU unit, on card, also comprise a local oscillator, ripple maker is carried in the output of local oscillator, and the output of carrier wave maker connects frequency mixer, frequency mixer receives the baseband signal from MCU unit simultaneously, and the output of frequency mixer accesses described diplexer after by wave filter.
Compared with prior art, the method that the invention provides envelope detection is carried out the hardware cell of restituted signal, and meets the hardware cell of modulation signal, can carry easily follow-up software, for this art development provides thinking.
Accompanying drawing explanation
Accompanying drawing is structured flowchart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
The present invention is a kind of radio-frequency identification card based on envelope detection, comprise one with the diplexer of identification end system two-way communication, the signal of reception is transferred to envelope detector by diplexer, after amplifier and comparer, input to again MCU unit, on card, also comprise a local oscillator, ripple maker is carried in the output of local oscillator, and the output of carrier wave maker connects frequency mixer, frequency mixer receives the baseband signal from MCU unit simultaneously, and the output of frequency mixer accesses described diplexer after by wave filter.
Principle of work of the present invention is:
Receiving course:
Identification end system sends carrier signal, received by diplexer, after reception, utilize envelope detector to carry out non-coherent demodulation-envelope detection, signal demand after demodulation further entered amplifier and amplified, signal after amplification further entered comparer again can obtain the manageable signal in MCU unit, is responded by MCU unit.
Emission process:
Send initialize signal by local oscillator, in carrier wave maker, generate carrier wave, carrier wave maker comprises basic phase locked-loop unit, in frequency mixer, multiply each other afterwards with from the baseband signal of MCU unit, obtain the CF signal with information, after device, can be sent by diplexer after filtering again, communicate by letter with identification end system.
Claims (1)
1. the radio-frequency identification card based on envelope detection, comprise one with the diplexer of identification end system two-way communication, it is characterized in that, the signal of reception is transferred to envelope detector by diplexer, after amplifier and comparer, input to again MCU unit, on card, also comprise a local oscillator, ripple maker is carried in the output of local oscillator, the output of carrier wave maker connects frequency mixer, frequency mixer receives the baseband signal from MCU unit simultaneously, and the output of frequency mixer accesses described diplexer after by wave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210405962.6A CN103778459A (en) | 2012-10-22 | 2012-10-22 | Radio frequency identification card based on envelope detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210405962.6A CN103778459A (en) | 2012-10-22 | 2012-10-22 | Radio frequency identification card based on envelope detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103778459A true CN103778459A (en) | 2014-05-07 |
Family
ID=50570670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210405962.6A Pending CN103778459A (en) | 2012-10-22 | 2012-10-22 | Radio frequency identification card based on envelope detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103778459A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040277A (en) * | 2017-03-24 | 2017-08-11 | 佛山华数机器人有限公司 | A kind of PLC wireless debugging devices |
| CN109474308A (en) * | 2018-12-19 | 2019-03-15 | 深圳易联凯科技有限公司 | A kind of signal demodulating system and method |
| CN111342855A (en) * | 2020-03-19 | 2020-06-26 | 复旦大学 | Low-power-consumption receiver for remote backscattering communication system |
-
2012
- 2012-10-22 CN CN201210405962.6A patent/CN103778459A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040277A (en) * | 2017-03-24 | 2017-08-11 | 佛山华数机器人有限公司 | A kind of PLC wireless debugging devices |
| CN109474308A (en) * | 2018-12-19 | 2019-03-15 | 深圳易联凯科技有限公司 | A kind of signal demodulating system and method |
| CN111342855A (en) * | 2020-03-19 | 2020-06-26 | 复旦大学 | Low-power-consumption receiver for remote backscattering communication system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140507 |